During the process of integrated CO2 capture and methanation, where the captured CO2 is converted into methane through hydrogenation. The concentration of H2 not only affects the reduction of catalysts, which are oxidised during the carbon capture stage, but also influences the catalytic performance and CO2 conversion.
For example, as shown in the following picture, the production of methane is almost doubled when the concentration of H2 increases from 5% to 10%, when Ru-Na2CO3 dual functional materials are investigated (https://doi.org/10.3390/catal7030088). The authors mainly attributed the enhancement of methane production to the promoted reduction of Ru-based catalysts. As investigated by the authors, the reduction rate of RuOx is significantly increased with the increase of H2 partial pressure from 1.3% to 2.86%.
